homework 23

# homework 23 - homework 23 NOORANI, ZOHEB Latest unpenalized...

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homework 23 – NOORANI, ZOHEB 1 Latest unpenalized work: Mar 24 2008 Mon- day 04:00 (after this date you can not make a perfect score). Work cutoF: Mar 25 2008, 4:00 am. Question 1, chap 12, sect 2. part 1 of 1 10 points A large wheel is coupled to a wheel with half the diameter as shown. r 2 How does the rotational speed of the smaller wheel compare with that of the larger wheel? How do the tangential speeds at the rims compare (assuming the belt doesn’t slip)? 1. The smaller wheel has twice the rotational speed and twice the tangential speed as the larger wheel. 2. The smaller wheel has half the rotational speed and half the tangential speed as the larger wheel. 3. The smaller wheel has twice the rotational speed and the same tangential speed as the larger wheel. 4. The smaller wheel has four times the ro- tational speed and the same tangential speed as the larger wheel. Question 2, chap 12, sect 3. part 1 of 1 10 points A wheel rotating with a constant angular acceleration turns through 21 rev during a 6 s time interval. Its angular velocity at the end of this interval is 17 rad / s. What is the angular acceleration of the wheel? Note: The initial angular velocity is not zero. Answer in units of rad / s 2 . Question 3, chap 12, sect 3. part 1 of 3 10 points As a result of friction, the angular speed of a wheel changes with time according to d θ d t = ω 0 exp ( - σ t ) , where ω 0 and σ are constants. The angular speed changes from an initial angular speed

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## This note was uploaded on 09/16/2009 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.

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homework 23 - homework 23 NOORANI, ZOHEB Latest unpenalized...

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